The first two 10,000-square-foot test sections are in place. The first used a heavy dosage of fibers (7-1/2 pounds per cubic yard of concrete) and 3/4-inch aggregate. The second included just 1-1/2 pounds of fiber per cubic yard and a top size aggregate of 1-1/2 inches in a more well-graded mix.
A small section also was placed with seven different surface finishes. This is the area where CTL's Howard Kanare will be monitoring moisture movement.
Today's other highlights? Two RFID-based maturity meters were put in place and will enable the testing firm to wirelessly obtain the logged data. No wires - just point and shoot, sort of. One is entirely embedded. The other consists of a probe embedded in the concrete and a lead that connects to the RFID device temporarily taped to one of the steel columns. When the second one's task is completed, only the probe will be left in the concrete rather than the entire RFID device.
Also, the crew got to try out Allen Engineering's new HDX 740 power trowel, which features 5-foot-diameter blades and joystick controls. They seemed to like it.
Tomorrow (Wednesday) should be an interesting day. The crew will be placing 4 different mixes in 5000-square-foot increments. (They put the vapor barrier down this afternoon.) Meanwhile, the testing firm will measure slab flatness (FF and FL) on the Tuesday pour, which also will be the object of a laser scan. Both of these data sets will be used to help evaluate slab shrinkage and curling over the next two years. More information will be posted here as we proceed.
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